Electric toothbrush



FIG. 1 is a perspective view of an electric toothbrush showing our new design;

FIG. 2 is a front elevational view of the design;

FIG. 3 is a rear elevational view of the design;

FIG. 4 is a right side elevational view of the design, wherein the left side elevational view is identical;

FIG. 5 is a top plan view of the design; and,

FIG. 6 is a bottom plan view of the design. 

The ornamental design for an electric toothbrush, as shown and described. 